✍ Scribed by Dr. Reinhold Braun
No coin nor oath required. For personal study only.
The stress corrosion cracking (SCC) behaviour of plates of the Al‐Cu‐Si‐Mn‐Mg alloy 2014‐T651 was investigated in short transverse direction performing various accelerated tests. Corrosive media used were: aqueous 3.5% NaCl solution, an aqueous solution of 2% NaCl + 0.5% Na~2~CrO~4~ at pH = 3 (according to LN 65666), and substitute ocean water according to ASTM D1141. C‐ring and tensile specimens were loaded under constant deformation, constant load and slow strain rate conditions. Alternate immersion tests in 3.5% NaCl solution clearly indicate the low SCC resistance of the alloy 2014‐T651 in short transverse direction. Under continuous immersion conditions the acidified 2% NaCl solution containing chromate is an appropriate synthetic environment, while neutral 3.5% NaCl solution does not promote severe stress corrosion cracking. The SCC susceptibility of 2014‐T651 is also observed in slow strain rate tests using substitute ocean water as well as acidified 2% NaCl solution inhibited by chromate. In 3.5% NaCl solution the evaluation of slow strain rate data is complicated by pre‐exposure effects.
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